Resources Contact Us Home
Control system for permanent magnet synchronous motor

Image Number 14 for United States Patent #5854547.

To provide a control system for a permanent magnet synchronous motor which can ensure stability of the current control system, even if the revolution frequency of the motor becomes higher and the terminal voltage of the motor exceeds the inverter maximum output voltage. In this method, when the revolution frequency of the motor exceeds a specified value, the size of the voltage vector is made a specified voltage vector, and a modulation factor based on its value is obtained. At the same time, a magnetic flux direction current correction value is found based on the size of a voltage vector from a polarity coordinates conversion unit and the above specified voltage vector size. Then, the magnetic flux direction current instruction is corrected by that value.

  Recently Added Patents
Image capturing device and automatic backlash correction method thereof
Composite syringe
Apparatuses, methods and systems for an a API call abstractor
Foamable low-viscosity mixtures
Pivoting hitch assembly
Radiation pattern insulator and multiple antennae system thereof and communication device using the multiple antennae system
System and method for archive verification
  Randomly Featured Patents
Adhesive blend of wood rosin and thermoplastic graft copolymer
Method and apparatus for traffic incident detection
Semiconductor light emitting device and semiconductor light emitting apparatus
Bridge weigh-in-motion system
Dish or pot scraper
Perforator apparatus and perforating method for photo film, and photo film working/securing apparatus and method
Rivet setting apparatus and method of setting a rivet
Cooccurrence and constructions
Systems and methods for providing match-up player's ticket features
Systems and methods for displaying hazards